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scripts/smb2-main: Reset script-level state upon smb2_discarded_messages_state()

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This is similar to what the external corelight/zeek-smb-clear-state script
does, but leverages the smb2_discarded_messages_state() event instead of
regularly checking on the state of SMB connections.

The pcap was created using the dperson/samba container image and mounting
a share with Linux's CIFS filesystem, then copying the content of a
directory with 100 files. The test uses a BPF filter to imitate mostly
"half-duplex" traffic.
This commit is contained in:
Arne Welzel 2023-04-25 17:19:14 +02:00
parent 5caab1a667
commit 3ac877e20d
8 changed files with 89 additions and 0 deletions
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7
scripts/base/protocols/smb/main.zeek
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@ -44,6 +44,13 @@ export {
PRINT_CLOSE,
};
## Whether to reset a connection's SMB script state whenever a
## :zeek:see:`smb2_discarded_messages_state` event is raised.
##
## This setting protects from unbounded script state growth in
## environments with high capture loss or traffic anomalies.
option enable_clear_script_state = T;
## This record is for the smb_files.log
type FileInfo: record {
## Time when the file was first discovered.